Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760771AbZF3XTp (ORCPT ); Tue, 30 Jun 2009 19:19:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760232AbZF3XSM (ORCPT ); Tue, 30 Jun 2009 19:18:12 -0400 Received: from terminus.zytor.com ([198.137.202.10]:59346 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758718AbZF3XSL (ORCPT ); Tue, 30 Jun 2009 19:18:11 -0400 Message-ID: <4A4A9CDD.4070204@zytor.com> Date: Tue, 30 Jun 2009 16:16:45 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Linus Torvalds CC: Yinghai Lu , Ingo Molnar , Mikael Pettersson , Matthew Wilcox , Grant Grundler , Linux Kernel Mailing List , linux-pci@vger.kernel.org Subject: Re: [BUG 2.6.31-rc1] HIGHMEM64G causes hang in PCI init on 32-bit x86 References: <200906261559.n5QFxJH8027336@pilspetsen.it.uu.se> <19013.29264.623540.275538@pilspetsen.it.uu.se> <4A45A5C1.5080701@zytor.com> <19013.59956.144640.331854@pilspetsen.it.uu.se> <20090629022911.GC20297@lackof.org> <4A484A8A.9020704@zytor.com> <19016.41349.636663.515540@pilspetsen.it.uu.se> <20090629112155.GJ5480@parisc-linux.org> <19016.44061.600652.676183@pilspetsen.it.uu.se> <4A490804.3040609@zytor.com> <4A494478.7020304@kernel.org> <4A494E3C.70304@kernel.org> <4A495C0D.2020807@zytor.com> <4A4966EF.6010809@kernel.org> <4A496D4B.3040608@kernel.org> <19017.53428.834539.389495@pilspetsen.it.uu.se> <4A4A25B1.5010102@zytor.com> <4A4A6888.30001@kernel.org> <4A4A6B1C.7030405@zytor.com> <4A4A701F.3050700@kernel.org> <4A4A81C9.9070008@zytor.com> <4A4A88A2.7010509@kernel.org> <4A4A921F.7080100@kernel.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 633 Lines: 21 Linus Torvalds wrote: > > On Tue, 30 Jun 2009, Yinghai Lu wrote: >> how about x = 0, y = 0x100? > > Yeah, no. Peter's trick doesn't work. Good catch. > > I don't see any single-use trick then, and so it needs the whole statement > expression mess. > Yes, the | trick only works if you know you have a nonzero alignment pad (or you want a full-block pad in the empty case.) -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/